Triarylmethane dyestuff.



TED STATES PATENT OFFICE.

RUDOLF GARTNER, or ELBERFELD, AND GEORG KoHREs, or LEVERKUSEN-ON-THE- 1 RHINE, GERMANY, ASSIGNORS TO SYNTHETIC PATENTS 00., mo, OF NEW YORK,

l N. Y., A CORPORATION OF NEW.YORK.

TRIARYLMETHANE DYESTUFF.

No Drawing. I

To all whom it 121 a 1 concern Be it known that we, RUnoLF GARTNER and Gnone KoHnEs, doctors of philosophy, chemists, citizens of the German Empire, residing, respectively, at Elberfeld and Leverkusen-on-the-Rhine, Germany, have invented new and useful Improvements in Triarylmethane Dyestuffs, of which the following is a specification.

Our invention relates to the manufacture and production of new and valuable basic coloring matters by condensation of aromatic ethylolamins with aromatic aldehydes and oxidation of the thus obtainable leuco compounds.

The new dyes are characterized by containing in their molecule the aggregation R meaning an aryl group.

The thus obtained coloring matters are powders of a metallic luster, easily soluble in water and alcohol generally with a greenish to bluish coloration, insoluble in ether and benzin, easily soluble in concentrated sulfuric acid generally with a reddish coloration. They dye green to blue shades on cotton mordanted with tannin and tartar emetic. By reduction with hydrochloric acid and zinc powder they yield the corresponding leuco compounds.

In order to illustrate the new process more fully the following example is given, the parts being by weight 300 parts of diethylol meta-toluidin are dissolved in 155 parts of hydrochloric acid (37 per cent.) and the resulting solution is heated. after the addition of 130 parts of ortho-chlorobenzaldehyde in a vessel provided with a reflux condenser while being stirred during 48 hours to 90-100 C. When the condensation is complete the excess of chlorobenzaldehyde is distilled over with steam and the leuco compound is isolated and dried. The thus obtained colorless leuco compound dissolves in alcohol and dilute mineral acids. The leuco compound may be converted into the coloring matter by oxidation in the following manner: 51 parts of this leuco compound are dissolved in 30 parts of hydrochloric Specification of Letters Patent.

Patented Aug; 10, 1915.

Application filed June 2, 1914. Serial No. 842,479.

acid (36 per cent.) and 60 parts of acetic .acid (50 per cent.) and oxidized with 240 parts of peroxid of lead in paste (10 per cent.) The lead is then removed from this solution by sodium sulfate and filtered off.

'Ihedvestutl is salted out with common salt filtered off and dried. It is a bluish-red powder having a metallic luster very easily soluble in water and in alcohol with a green coloration. insoluble in ether and benzin and easily soluble in concentrated sulfuric acid with a yellowish-red coloration. The new dvestuif has most probably the following formula Illa/k CH3 l f and dyes from an acid bath a pure green tint fast to light on cotton treated with tannin and tartar emetic and yields by reduction with zinc powder and hydrochloric acid the corresponding colorless leucocompound of the following formula:

on-cmwn/ I cin-oin-on hydes with-aromatic ethylolamins and containing in their molecule the aggregation of the group:

R meaning an aryl group, being powders of a metallic luster, easily soluble in water and alcohol generally with a greenish to bluish coloration, insoluble in ether and benzin, easily soluble in concentrated sulfuric acld generally with a reddish color; yielding by reduction with hydrochloric acid and zinc powder the corresponding leuco compounds; and dyeing green to blue shades on cotton mordanted with tannin and tartar emetic, substantially as described.

2. The new basic coloring matters being condensation products of aromatic aldehydes with aromatic diethylol-amins and containing in their molecule the aggregation of the group:

on-cm-on c t R meaning an aryl group, being powders of a metallic luster, easily soluble in water and alcohol generally with a greenish to bluish coloration, insoluble in ether and benzin, easily soluble in concentrated sulfuric acid generally with a reddish color; yielding by reduction with hydrochloric acid and zinc powder the corresponding leuco compounds; and dyeing green to blue shades on cotton mordanted with tannin and tartar emetic substantially as described.

3. The new basic coloring matters being condensation products of substituted benzaldehydes with aromatic ethylol-amins and containing in their molecule the aggregation of the group:

R meaning an aryl group and R a substituted benzene nucleus, being powders of a metallic luster, easily soluble in water and alcohol generally with a greenish to bluish coloration, insoluble in ether and benzin, easily soluble in concentrated sulfuric acid generally with a reddish color; yielding by reduction with hydrochloric acid and zinc powder the corresponding leuco compounds; and dyeing green to blue shades on cotton mordanted with tannin and tartar emetic, substantially as described.

4. The new basic coloring matters being condensation products of aromatic aldehydes with ethylol toluidins and containing in their molecule the aggregation of the group:

R meaning a methyl substituted benzene nucleus, and R an-aryl group, being powders of a metallic luster, easily soluble in water and alcohol generally with a greenish to bluish coloration, insoluble in ether and benzin, easily soluble in concentrated sulfuric acid generally with a reddish color; yielding by reduction with hydrochloric acid and zinc powder the corresponding leuco compounds; and dyeing green to blue shades on cotton mordanted with tannin and tartar emetic, substantially as described.

" '5. The new basic coloring matters being condensation products of aromatic aldehydes with diethylol-meta-toludin and containing in their molecule the aggregation of the group:

0H-0HzCHz N N CHz--CHzOH I 0HCHzCH2 CHT-CHzOH being after dried and pulverized a bluishred powder of a metallic lu ster very easily soluble in water and alcohol with a green coloration; insoluble in ether and benzin; easily soluble in concentrated sulfuric acid with a yellowish-red coloration; yielding upon reduction with hydrochloric acid and zinc powder the corresponding colorless on-cm-cu N OH-OHz-CH/ leuco compound of the following general tint fast to light on cotton mordanted with formula: tannin and tartar emetic, substantially as 15 on cH2cH, N CHr-CH O deic -ikedtt 1 f 1 1 t 1 \CH2 CH2 OH n es nnony ieieo e 1a\e 161611110 5 0H l set our hands in the presence oftwo subscribing witnesses.

1 1 CH3 l H CH3 RUDOLF GARTNER. 1o F GEORG KOHRES.

I Witnesses Axis VANBQRG, and dyeing from an acid bath a pure green HANS BRI'JGKXER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

